Some small improvements

[mMontu]

This version includes some small improvements, as help file and reduction on load time.

[mMontu]

Thanks for the corrections, and also for sharing this great plugin!

[mMontu]

I'm using this great plugin for some years now, and get used to open new Vim
instance to execute it, as changes my current session, and interfere with
some other plugins.

Browsing the code I found that probably the session corruption happens because
it doesn't expects the user has tab pages open. After saving the session, it
closes all windows on current tab, executes, then restore the session, what
restores current tab but duplicates all other tab pages. The option 'ssop',
which controls what is saved with :mksession, is not set to a fixed value.

But instead of correcting these issues, probably it is better to use a new tab
page for this plugin, as this causes less interference with other plugins, as
Tagbar, which displays an error message on SessionLoadPost event.